It won't seem that way soon enough. With everything Core everything is needed to play the game by the "Official" rules. That was the great thing about 3.x Core Rules. The official policy of WotC was that you only needed the "Core" books to play. Now the official policy is that every book is Core including setting books and that players should buy all of them because all of them will have relevant information to every player. I would love WotC to come out and say that players will be fine just buying the PHB, but with them releasing a PHB2, PHB3, PHB4, PHB5, etc. I just don't see that. Now they expect players to buy 3 campaign books a year as well, including ones for settings they are not interested in because those books will have generic material useful to everyone. I might change my mind on the setting books if they republished the classes, powers, and feats from these books in later PHBs, but I don't see that happening.